I would say she is a realist because of the fact of how she left her boyfriend because of her studies. However, the Realist/Idealist situation more so refers to how they view relationships rather than life. So as someone stated prior you will need to inquire her as to how she would view her perfect relationship. If she gives you a spill on how she wants "prince charming" (meaning a guy that has 0 character flaws) then she is an idealist. However, if she tells you she wants a guy that cares about her and loves her but doesn't have to be perfect then you have yourself a realist. Hope this helps!